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7th November 2008, 01:18 | #1 | Link |
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AAC audio and bitrate
Is it possible at all for an AAC audio file to be of Constant Bit Rate (CBR), instead of VBR or ABR? Reading info from various sources inidcates different things to me so far...
Why MediaInfo always displays output AAC audio file as VBR if using FFMPEG with libfaac codec? If possible at all for to config libfaac to output CBR? Or does anyone have a build of libfaac codec which support CBR? Last edited by David1105; 7th November 2008 at 01:21. |
7th November 2008, 01:31 | #2 | Link | |
ffx264/ffhevc author
Join Date: May 2007
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Quote:
MediaInfo displays VBR because FAAC only encodes in VBR. It does not support CBR encodings |
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7th November 2008, 01:51 | #3 | Link | |
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Quote:
neroaacenc -br 1 -cbr 128000 -if input.wav -of output.m4a But MediaInfo still says: Bit rate mode : Variable Bit rate : 128 Kbps |
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7th November 2008, 01:56 | #4 | Link | |
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Quote:
you cannot mix both -br and -cbr. You can either use quality-based encoding (-q), ABR-based encoding (-br) or CBR-based encoding (-cbr) if MediaInfo still shows its VBR, then there's something wrong with it |
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7th November 2008, 02:07 | #5 | Link | |
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Quote:
Wrong with what? MediaInfo or neroAacEnc? |
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7th November 2008, 02:42 | #8 | Link |
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I never said I was sure about it. if neroAacEnc didn't support CBR-mode encoding, the -cbr option won't be there. -cbr is mostly intended to be used for streaming. I'm not really 100% sure if it's "hard" CBR or if neroAacEnc just limits bitrate bursts during -cbr encoding.
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